Working fluid composition having ketone-containing compound for use in refrigeration system

Abstract

A working fluid composition for use in a refrigeration system which comprises a refrigerating oil comprising a compound having one or more ketone groups in the molecular structure as a base oil and a hydrofluorocarbon.

What is claimed is: 
     
       1. A working fluid composition for use in a refrigeration system which comprises a refrigerating oil comprising a compound having one or more ketone groups in the molecular structure as a base oil and a hydrofluorocarbon; wherein said compound is represented by Formula (II): ##STR17##  wherein Q represents a monocyclic or dicyclic compound which may contain an oxygen atom in the ring thereof, R 5  represents a substituent having one or more ketone groups in the molecular structure and is selected from the group consisting of aliphatic acyl groups having a linear or branched structure, aromatic acyl groups, ketoacyl groups, acylalkyl groups, acylalkyloxy groups or acylaryloxy groups, alkyloxyacyl groups, and aryloxyacyl groups, R 6  represents a substituent having one or more ether groups in the molecular structure and is selected from the group consisting of alkyloxy groups, aryloxy groups, and alkyloxyalkyl groups or aryloxyalkyl groups, and x represents an integer of 1 to 20, and y represents an integer of 0 to 20, with the proviso that when x is two or more, each R 5  may be identical or different, and that when y is two or more, each R 6  may be identical or different.   
     
     
       2. The working fluid composition for use in a refrigeration system according to claim 1, wherein the mixing ratio by weight of the hydrofluorocarbon/refrigerating oil is 5/1 to 1/10. 
     
     
       3. The working fluid composition for use in a refrigeration system according to claim 1, wherein said compound has a number of carbon atoms of not less than 6 and not more than 300. 
     
     
       4. The working fluid composition for use in a refrigeration system according to claim 1, wherein x represents an integer of 1 to 4; and y represents an integer of 0 to 4. 
     
     
       5. The working fluid composition for use in a refrigeration system according to claim 1, wherein said hydrofluorocarbon is selected from the group consisting of difluoromethane (HFC32), 1,1-difluoroethane (HFC152a), 1,1,1-trifluoroethane (HFC143a), 1,1,1,2-tetrafluoroethane (HFC134a), 1,1,2,2-tetrafluoroethane (HFC134) and pentafluoroethane (HFC125).